it clearly hasn't. >> by striking a marathon like this, you're striking at america. killing americans celebrating the freedoms we have in this country. and these folks are wanting to make us live in fear and that's what they succeeded in doing in boston at least for several days. >> but not on this day. this morning, boylston street, the site of the bombings, reo n reopened, back in business. >> that's all for this edition of "dateline." we're off next wednesday. we'll see you next friday at 9:00, 8:00 central. i'm lester holt for all of us at nbc news, good night. . - in the criminal justice system, sexually based offenses are considered especially heinous. in new york city, the dedicated detectives who investigate these vicious felonies are members of an elite squad known as the special victims unit. these are their stories. - you look nice. - aw, thanks. - friday night date with cassidy? - uh, yeah, sort of. we're taking his mom out to an early bird dinner. he'll make it up to me later. - his mom? you two getting serious? - well, i wouldn't say we're picking out c